The solution
One possible solution is cogging torque-reduced motors, such as the DSH1 high-precision servo motors made by Baumüller. If such high-precision motors cannot be used for performance reasons, then Baumüller offers the “cogging torque compensation” function integrated in the drive.
The functionality is available in the firmware. The ProDrive analysis tool can be used to measure the real cogging torques and compensate for them in the servo drive. The cogging torques that occur are identified by an automatic measurement, the so-called teach-In, during commissioning. The controller is notified at which point and with which strength the cogging torque will occur during normal operation. A position and angle-dependent current is then calculated in the drive controller, which counteracts the existing cogging torque. The precontrol signal at the setpoint of the torque-forming component of the current balances out the expected waviness. In this way, a uniform torque along the entire traversing range and maximum product quality are possible.
This function can be used, for example, to produce uniform and streak-free films by calendering.
